diff --git a/tests/sets/testequivalence.nim b/tests/sets/testequivalence.nim
index 8a83e2a213..7c5d9e3e90 100644
--- a/tests/sets/testequivalence.nim
+++ b/tests/sets/testequivalence.nim
@@ -1,3 +1,6 @@
+discard """
+  output: ''''''
+"""
 import unittest
 import sets